Locomotive-boiler.



F. F. GAINES.

LOCOMOTIVE BOILER.

AFPLlCATION FILED 0CT.13, m2.

Patented May 4, 1915.

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FREDERICK F. GAINES, 0F SAVANNAH, GEORGIA. ASSIGNOR, BY MESNE ASSIGN- MENTS, TO AMERICAN ARCH COMPANY, OF NE YORK, N. Y., A CORPORATION OF DELAWARE.

LOCOMOTIVE-BOILER.

Specification of Letters Patent.

Patented May 4, 1915.

gia, have invented certain new and useful Improvements in Locomotive-Boilers, of which the following is a specification.

My invention relates to improvements in locomotives and has particular reference to improvements in the fire-boxes of locomotive boilers.

The: object of my invention is to increase the efllciency and the fuel economy of loco-- motive boiler fire boxes; to provide a loco motive boiler fire box wherein the fire box gases shall be thoroughly intermingled and intermixed to the end that the fuel shall be efiiciently consumed; wl gerein the progress.

of the gases from the fuel bed to the fines shall be bafiled; wherein the temperature of point of high efiiciency; and wherein the hot gases of combustion shall be forced to travel. over substantiallythe whole interior surface of the fire box.

A further object of my invention is to a construction of refractory cross wall or baffle wall for locomotive boilers of the extension fir box tyge which'shall be capable of being installe. 'w

of labor and expense A further -object-of my invention is to provide a construction of cross wall for such fire boxes through which air can be 1ntroduced to the firebox forf mixing with the burning fire box gases above the fuel bed and WltllOlllZyCllttlIlg or disturbing th e-fire box sheets.

A further object of my invention is to pro vide alocomotive boiler fire box of the extension firebox type. with a refractory air feeding bafile wall of simple and durable construction. l

My invention consists in a locomotive boiler fire box of the extension fire box type provided with a refractory cross-wall ar ranged atthe forward end of the fire box and supported upon the floor of the extension, having downwardly extending poi tions in the forward end of the fire box extending from the base of the cross wall to the level of the grate and in contact with the. front water leg and provided with air conduits adapted =to ,cause air {to be ingases shall be maintained at a th a ,minimum jected into the fire box beneath the arch and from beneath the grate.

My invention further consists in a fire box of the extension combustion chamber type, having a cross wall supported on the floor of the extension, adjacent to the rear end thereof, an extension of the wall projecting downwardly to the level of the grate, air conduits rising through the wall from the lower end thereof and opening through the rear face of the wall, water circulating tubes rising from the floor of the extension and extending upwardly and rearwardly through the fire box to the end thereof, and a refractory arch supported by the tubes'and extending rearwardiy through the fire box from the upper end of the said wall, said air conduiltls opening into the fire box beneath th arc My invention further consists in a locomotive fire box of the extension fire box type provided with a refractory cross wall ar'- ranged in the rear end of extension and hav- My invention also consists in the several 8 arrangements of parts and in the features of construction whereby the above and other objects are attained, and all as hereinafter described, and particularly pointedout in the appended claims. H

My invention will be more readily understood by reference to the accompanying drawings forming part of this specificatiom and in which- Figure 1 is a central, vertioiil,longitudinal 95 section (.I a fire box equipped with a .bafile. wall and embodying my inventiomFig. 2, is y a transverse vertical section of the fire box 7 on the line 2-2 of Fig. 1; Fig. 3 is a. transverse section of the archon line 3-3 of Fig; 1 06- 1 and Fig. 4 is a detail section of th 'forward end of the fire box showing a modified form of my invention.

Within thelast few years the benefits of bafile walls in locomotive fire boxes have 105 been amply demonstrated, and it has been the object of inventors to apply such bafl'le walls to substantially every construction of locomotive boiler. In such application, many difliculties have arisen particularly as it is desired that air be added to the burning fire box gases above the fuel bed and it has been a diiliz'ult problem to provide a wall in fire box-2s of the extension combustion chamber type through which ir could be admitted to the fire box above the fuel bed without cutting or otherwise mutilating the boiler sheets, particularly the sheets which form the lower part of the extension of the fire box.

By means of my present invention I am enabled to build cross walls in the fire boxes of the extension combustion chamber type, and thereby derive the benefits of such walls without the expense or the detrimental results of providing openfngs in the several sheets of the boiler through which air can be admitted to the wall, and further, I am enabled to install cross walls in such fire boxes with a minimum expenditure of time and labor.

A locomotive boiler firebox A, as illustrated in the drawings, comprises a flue sheet a at its forward end, a rear sheet a provided with a fuel door or opening a a crown sheet 'a and side sheets a The fire box is provided with a grate a of usual constructionand the space occupiedrby the grate is less than the total length of the fire box and consequently the front water leg a is arranged rearwardly from the fluesheet and theportion of the fire box a which lies between the front water leg and the flue sheet forms the fire box. extension or the extensioncombustion chamber.

- The strong artificial drafts which it is necessary to use in locomotive boilers at the present time, in order that sufficient fuel may be consumed to produce the necessary power, results in the fire boxgases'bcing drawn directly from the fuel bed to the flues a", which extend forwardly in theboiler from the flue sheet a. The obj cct of a cross wall or baffle wall in the boiler, particularly when arranged in the front end thereof, is to prevent such direct flow of the gases of combustion and force'them into the rear 7) of refractory bricks b and rises to sub stantially half of the height of the fire box at this point. I provide this wall with several air conduits b opening at their upper ends 6 into the fire box through the rear protect these tubes by means of refractory 0 coverings b which practically'form down wardly extending projections of the wall B, which extensions project downwardly to substantially the level of the grate. I support these refractory coverings or conduits upon 35 a transversely extending shelf b" secured by bolts b to the rear wall 7)" of the front water leg. The tubes or pipes b are provided on their lower ends with forwardly curved elbows b having flaring inlets I)",

and I support these tubes and their elbows in position by means of brackets b, which I bolt to the mud ring a of the fire box. The air inlet conduits thus extend from their and serve to inject air into thefireboxabove the fuel bed and from beneath the firebox. The wall B, as thus described, divides the fire box into a main combustion chamber a above the grate and the auxiliary com bustion chamber a between the wall and the -flue sheet. Under some conditions in order to obtain the desired results, I arrange a refractory arch C extending-rearwardly and upwardlythrough the fire box from the upper end of the wall 13 and for the purpose of supporting this arch in position I arrange water circulatingtubesD extending longi-. tudinally through the fire box which rise from the floor of the extension combustion chamber a and curve upwardly and rearwardly therefrom, passing through the up per part of the wall B and then extending in an upwardly inclined position to the rear These lower conduits 75 ii outlets b to the inlet f Of the several tubes 95 part of the fire box before-they flow forwater leg a of the fire box.- ,Thse tubes wardly into the fines, and this results in-the gases flowing over substantially the whole interior surface of the fire box, and in position to best deliver their heat to the water of the boiler. i

The from water leg at of the boiler is joined at its upper endto the main part of;

' cent to the rear end oi mouth of the extension. This wall s composed of several rows D serve to increase the circulation of water from the lower to-the upper part of the boiler, and as they extend through the hottest zone of thegasesin the fire box; they serve to increase the steaming capacity of the boiler.

The-arch C consists of several transverse rows 0 of refractory bricks 0 These bricks 1 preferably make of'such a le th that ported at their ends on adjacent tubes. This refers to the-bricks which. fill in the spaces between the tubes. v v Y p I- arrange side .brick's a to fill in'. the

spaces between theoutermosttubes and the they extend from tube to tube and are supof transverse rows 0 adjacent side sheets. These bricks 0 rest at their inner ends upon the outer tubes and the side sheets. Th posed between the sheets and are thus maintained in position. In some situations he rows 0 are sufficient to provide an arch which produces the results desired, but the form illustrated in the drawings consists of a number and the rear end of the arch is preferably arranged about the middle of the length of the fire box. The air conduits in the wall discharge the air bethe arch in position where i t is best air inlet tubes which pass through the boiler space a below the fire box extension.

This application is subsidiary to the application of John P. Nefi', Serial No. 767,055, filed Ma 12, 1913, which some of the ii claimed by Mr. Ne as the first inventor thereof.

claim: 7 1. In a locomotive boiler fire box of the a. refractory of fire'brick charge openings from the rear face of the wall beneath the arch and above the fuel bed.

2. n a locomotix e boiler fire box of the extension fire box type, a refractory cross wall closing the low r part of the mouth of the extension provided with vertically extending, transversely spaced air conduits, and having relatively narrow, hollow refractory portions extending downwardly to the level of the grate adapted to said conduits, a bracket secured to the rear wall of the front water leg and hollow extensions wall, whereby air is admitted through the conduits. to the fire box above the fuel bed.

In testimony whereof, I have hereunto set my hand, this 1st day of Oct, 1913, in the presence of two subscribingwitnesses.

FREDERICK F. GAINES.

Witnesses:

J. R. KOERPER, W. DAVIS. 

